To display basic reviews on a product page, you want to add the following line to your catalog.xml within catalog_product_view.
“<block type=”review/product_view_list” name=”product.info.product_additional_data” as=”reviews” template=”review/product/view/list.phtml”/>”
And Add below line
<?php echo $this->getChildHtml(‘reviews’) ?>
to your catalog/product/view.phtml template